The charging label and the tables shown refer to system tempera-
tures and pressures in cooling mode only. A refrigerant charging
label is attached to the outside of the service access door. If charge
level is suspect in Heating mode, reclaim all refrigerant and charge
to nameplate amount. (This information may be obtained from the
physical data table also.)
IMPORTANT: When evaluating the refrigerant charge, an indi-
cated adjustment to the specified factory charge must always be
very minimal. If a substantial adjustment is indicated, an abnormal
condition exists somewhere in the cooling system, such as insuf-
ficient airflow across either coil or both coils.
REFRIGERANT CHARGE — The amount of refrigerant charge
is listed on the unit nameplate and /or the physical data table. Refer
to the Refrigeration Service Techniques Manual, Refrigerants
Section.
NO CHARGE — Check for leak. Use standard evacuating tech-
niques. After evacuating system, weigh in the specified amount of
refrigerant (refer to system data plate).
LOW CHARGE COOLING — Use Cooling Charging Charts
(Figs. 23-35). Vary refrigerant until the conditions of the chart are
met. Note that charging charts are different from type normally
used. Charts are based on charging the units to correct superheat
for the various operating conditions. Accurate pressure gage and
temperature sensing devices are required. Connect the pressure
gage to the service port on the suction line. Mount the temperature
sensing device on the suction line and insulate it so that the
outdoor ambient does not effect the reading. Indoor air CFM must
be within the normal operating range of the unit.
TO USE COOLING CHARGING CHARTS — Take the outdoor
ambient temperature and read the suction pressure gage. Refer to
the chart to determine what the suction temperature should be.
NOTE: If the problem causing the inaccurate readings is a
refrigerant leak, refer to Check for Refrigerant Leaks section.
Table 4B—Wet Coil Air Delivery
Unit 50JX 024-060 (Deduct 10% for 208v)*
UNIT MOTOR SPEED
EXTERNAL STATIC PRESSURE (IN. WG)
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
024
Low
Watts 275 273 271 270 -------
Cfm923844754669-------
Med
Watts - - - 359 353 350 347 341 - - -
Cfm - - - 941 876 814 737 622 - - -
High
Watts ------447439431423-
Cfm------968869765659-
30
Low
Watts 276 276 272 --------
Cfm963929781--------
Med
Watts 375 377 371 362 354 350 -----
Cfm 1202 1170 1079 976 884 807 -----
High
Watts ----469449435428---
Cfm----1174 988 828 718 - - -
36
Low
Watts 462 451 431 411 394 381 -----
Cfm 1374 1290 1205 1116 1020 916 -----
Med
Watts 523 506 490 471 449 426 -----
Cfm 1500 1408 1301 1190 1082 977 -----
High
Watts - 645 628 610 595 584 575 ----
Cfm - 1474 1369 1267 1169 1069 962 ----
42
Low
Watts 620 600 586 574 562 548 530 510 487 462 439
Cfm 1662 1621 1581 1540 1496 1447 1392 1331 1263 1186 1103
Med
Watts ----686661634606577547517
Cfm----1722 1662 1594 1515 1427 1330 1227
High
Watts -------757730704682
Cfm-------1669 1577 1486 1402
48
Low
Watts 620 600 586 574 562 548 530 - 487 - -
Cfm 1662 1621 1581 1540 1496 1447 1392 1331 1263 - -
Med
Watts 763 747 729 709 686 661 634 606 577 547 517
Cfm 1917 1868 1822 1774 1722 1662 1594 1515 1427 1330 1227
High
Watts - - - 852 832 809 784 757 730 704 682
Cfm - - - 1982 1914 1839 1757 1669 1577 1486 1402
60
Low
Watts 597 592 578 526 460 452 445 ----
Cfm 2265 2190 2101 2033 1974 1869 1614 ----
Med
Watts 754 730 707 687 671 658 646 630 603 558 486
Cfm 2383 2282 2202 2134 2070 2005 1935 1858 1771 1667 1576
High
Watts 901 876 856 836 813 785 755 723 696 681 687
Cfm 2480 2383 2301 2233 2175 2122 2066 1998 1910 1788 1619
* Air delivery values are based on operating voltage of 230 v or 460 v, wet coil, without filter or electric heater. Deduct filter and electric heater pressure drops to obtain
static pressure available for ducting.
NOTES:
1. Do not operate the unit at acooling airflow that is less than 350 cfm foreach 12,000 Btuh of rated cooling capacity. Evaporatorcoil frosting may occur at airflows below
this point.
2. Dashes indicate portions of table that are beyond the blower motor capacity or are not recommended.
3. Deduct 10% for 208v.
18
